摘要
研究了用酸浸与钠碱熔融法从钨渣中富集和回收钽铌。钨渣用5%盐酸,在40℃下浸出30 min,盐酸用量为理论用量2.5倍,可除去其中72.1%的铁和74.7%的锰,此时的钽回收率达92%,铌回收率达84.6%。将所得酸浸出渣进行钠碱熔融,当钠碱与浸出渣的质量比为3∶2、反应温度为800℃、反应时间60 min时,得到Ta2O5、Nb2O5含量分别为0.48%及2.74%的钽铌富集物,钽的回收率可达83%,铌的回收率可达74.8%。钽、铌的总回收率分别为76.4%和63.3%。实验表明钨渣经酸浸与钠碱熔融处理,钽铌能够得到有效富集和回收。
The enrichment and recovery of tantalum and niobium through acid leaching and sodium alkali fusing from tungsten residue is studied. When 5 % HCl consumption amounts to 2.5 times of the theoretical value,reaction temperature is 40 ℃ and reaction time is 30 min,72.1% of the iron and 74.7% of the manganese can be removed and the recovery of tantalum and niobium are 92% and 84.6% respectively. Then the acid leach residue was fused in NaOH and Na2CO3. When the mass ratio of acid leach residue to alkali is 3 ： 2 and reaction time is 60 min,the content of Ta2O5 and Nb2O5 in the product could be 0.48% and 2.74% respectively. And the recovery of tantalum and niobium are 83 % and 74.8 % respectively. The total recoveries of tantalum and niobium are 76.4% and 63.3% respectively. It shows that tantalum and niobium can be effectively enriched and recovered from tungsten residue by acid leach and sodium alkali fusing.
出处
《稀有金属与硬质合金》
CAS
CSCD
2008年第2期6-9,14,共5页
Rare Metals and Cemented Carbides
关键词
钨渣
酸浸
钠碱熔融
钽铌
回收
tungsten residue
acid leach
sodium alkali fusing
tantalum and niobium
recovery
